Circular velocity curve and frequencies for power-law models. We show potentials with different slopes indicated in the legend. The models used in the present study are shown as thicker solid lines, while dashed lines show other models for comparison. We show the circular velocity curve (top left), the azimuthal frequency (top right), the radial epicyclic frequency (bottom left) and (bottom right). The vertical dotted line marks the Sun’s position R₀ = 8 kpc.